A.parallel bearings
B.long-range bearings
C.short-range bearings
D.cross bearings
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A.their transmitters
B.their receivers
C.their radars
D.their lorans
A.if
B.how
C.when
D.where
A.radar
B.omega
C.satellite navigator
D.DF
A.While a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracy
B.The satellites are in equatorial orbits around the earth about 60°of longitude apart
C.The satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satellite
D.The ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking
最新試題
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.
The loran lines drawn on navigation charts represent（）.
The（）transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems.
（）is a digitized“picture”of a chart.
Which one of the followings does not limit the effective range of radar（）.
With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds（）.
The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．
Automatic identification systems（AIS）are required to（）.
（）is not a component of GPS.